"Growing up, I did almost all the household chores while my brother did very few (and the ones we kids didn’t do, my mother did). It wasn’t because my parents told me that, as a girl, I was the natural choice, but because I just 'seemed better' at everything. The result was that I did everything, and slowly my 'advantage' over my brother – defined here as efficiency, not actual advantage – which was at first small, became large."
-- Cathy O'Neil, Comparative Advantage in International Trade and in Married Life